We are migrating all our on-premise applications to AWS cloud.
Most of them are/will be migrated to Kops-managed Kubernetes clusters, and some are/will be migrated as lambdas.
To secure this migration, we are using HAProxy in front of both on-prem and on-AWS deployments (first only sending 1% of each application’s requests to AWS, then 5%, then 25% and so on).
Disclaimer: This article describes a feedback from production environment. We have changed the name of applications mentioned here, but everything else is true within the limits of our knowledge.